Lock-nut.



J; J. PIFIBLD.

LOGK NUT.

AP 00T, 24 1 wiinesse@ Iva/cn James-JT 1"" g LM alle UNITED srnrns lratlnNr onirica.

. JAMES J. FIFIELD, OF MEDFORD, MASSACHUSETTS, ASSIGNOR OF ONE-IALF TO LOUIS BUFF, OF B,OSTONM ASSACHUSETTS.

`LOCK-N UT.

Specification of Letters Patent.

Patented :any so, 1909.

Application led October 24, 1908. Serial No. 459,299.

' To all whom 'it 'may concern.'

proved form of lock nut.

Be it known that I, JAMES J. FIFIELD, a citizen of the United States, a resident of Medford, in the county of Middlesex and State of Massachusetts, have invented an Im rovement in- Lock-Nuts, of which the fol owing description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention comprises a new and im- `In the drawings showing a preferred form of nut embodying my invention, selected for illustration, Figure 1 is a side elevation of the lock nut in unlocked osition upon a railroad rail, as applied by rand Fi 2 is a vertical section, showing the nut in ocked position,` screwed up by a wrench, the nut being turned one quarter around; Fig. 8, an elevation of the nut as shown in Fig. 1 and Fig. 4, a view of the under side of the nut.

Referring to Figs. 1. and 2, thenut A of otherwise usual form, has one side (L slotted l 'at b, preferably to a point beyond the bore of the nut. The base portion c of the'nut is drilled at one or more points, herein at two points d, d to receive the pins e, @,itting l snugly but also movable in the holes referred to, and preferably of harder metal than the usual surface, for example, the fish plate f,

Figs. 1 and 2, with which their' ends come into contact. The ins e c are headless and are of substantially uniform diameter throughout, so that they may readily be re moved in the event of undue wear at either end. The inner ends ofthe pins e, e are normally in contactwith the under side g of the outer member' h of the nut, and the outer ends of said pins protrude somewhat beyond the inner face i, of the nut.

When the nut is applied, it may be readily turned up with the iuigers until the pins e, e

'contact with the surface or plate Further nut to be securely locked against rotation` upon the bolt. The pins e, e being of har'd metal the outer ends thereof doA not readily i Wear, consequently they may be used inde nitely. Furthermore, turning of theA nut may cause the pins e, e, owing to their hardness,'to cut slightly into 4and become, so to speak, anchored in the surface j of the plate f, and tend to prevent retrograde movement of the nut to loosen the same.

When the nut is unscrewed the member h readily springs back into its normal position;

unless the nut has been turned up unusually tight. In that case a slight blow with a ham-- mer or wrench upon the outer surface of the nut will return the member h toits normal position.

If the nut should be turned up so tightly as to break oil' the member 71, the remaining 'ioV member c, constituting the main portion of the nut still furnishes a holding means and as effectivel as the ordinary nut. Since the slot if is extended beyond the bore into the thick r portion of the nut, there is little danger of the member 7L breaking oif.

My improved loclvnut is certain in its operation and readily applied, requiring no special tool for locking it; yet its use does not destroy nor even mutilate the thread either of the bolt or nut. There are'no separate or nicely adjusted parts or members to. become detached and possibly lost, andthe nut may be manufactured at small cost.

' Claim. i

The combination with a transversely slotted nut, one member of which is provided with a longitudinal auxiliary passage, of a normally withdrawable head ess clampactuating pin of substantially uniform diameter throughout and arranged in said auxiliary passage' and in contact with the lother nut membenthereby to cause thread clampingv iiexure of the latter 4upon screwing up of the nut.

In testimony whereof, l have signed my name to this specification, in the presence of `two subscribing witnesses.

- JAMES J. FFIELD.A

lNitnesses Flvnnn'rr S. Eimer, ROBERT H. KAMMLER. 

